1930
Royal Botanic Gardens, Kew.
1935
Waugh, F. A. (Frank Albert), 1869-1943.
1933
New York Public Library
Kredel, Fritz, 1900-1973.
20th century
1939
Wiafich, Wolfgang.
Triscott, S. P. Rolt (Samuel Peter Rolt), 1846-1925.
Roshardt, Pia, 1893-
late 1910s - early 1960s
Eaton, Mary Emily.
circa 1930
Weisz, Josef, 1894-1969.
Vitale, Alice Thoms.